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[aprssig] WinAPRS question

Tapio Sokura oh2kku at iki.fi
Sat Dec 31 04:04:31 UTC 2005


John Mc Hugh wrote:
> I'm running WinAPRS 2.7.2 and I see a mobile station that has a small 
> circle around it. What is that? Is it something he is putting out or do 
> I have a setting wrong? Is it his PHGD?

He's using position ambiguity (two digits). It means that only the 
degrees and whole minutes of the reported position are (presumed to be) 
accurate, i.e. the actual location is somewhere inside a square one 
nautical mile in south/north direction and a bit under one nm in 
east/west direction. I guess the circle is winaprs's way of showing the 
approximate area inside which the station should be.

   Tapio




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